Abstract
Acceleration adds negative effect to Hemispherical Resonator Gyro (HRG) output; therefore, it is important to model the influence and then make necessary compensations, accordingly. Based on the elastic thin-shell theory under the Kirchhoff-Love assumption, the acceleration influence on HRG forcing system is modeled and then schemes for incentive are suggested. Firstly, the dynamic model of resonator is introduced. Then, inertial load and electrostatic force are calculated to obtain the deformation of resonator. At last, schemes for pickoff incentive are proposed to weaken the effect of acceleration on HRG forcer. The simulation results illustrate that acceleration has negative effects on the exciting confidents of forcers and the proposed scheme can eliminate the acceleration influence on forcing system.
Highlights
The hemispherical resonator gyro (HRG) is a solid state gyroscope whose sensing property is based on the vibration structure
It is reported that HRGs have already achieved 18 million h of continuous operation with 100 percent mission success in space application
The dynamic characteristics of the HRG resonator in the condition of multielectrode incentive are researched in this paper, and the reason for causing the exciting errors by acceleration is analyzed. 3 schemes for incentive are suggested and the influences of acceleration on the deformation of the resonator in the 3 schemes are analyzed, respectively; the conclusions are as follows
Summary
The hemispherical resonator gyro (HRG) is a solid state gyroscope whose sensing property is based on the vibration structure. It has the features of high accuracy, long life span, inherent high reliability, natural radiation hardness, and no parts that can wear out, which makes it very suitable for applications in long-time working state such as in space vehicles [1,2,3,4]. The resonator’s deformation will increase the errors in the excitation system, which is an important part of gyro’s drift of HRG, so the influence of resonator deformation caused by acceleration on forcing system will be discussed in this paper
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